Made by Blumac Software, Mac BlurayRipper Pro is great software to decrypt your Bluray discs to your HDD. It only decrypts the files, leaving the structure intact so it can be backed up to Bluray media in the future.
If you want to transcode the video to a different format such as MKV or MP4 you’d be better off with some other software (such as MakeMKV) as it doesn’t support chapters, subtitles, language information.
But for $20 – it’s a good tool to have if you’re into backing up your stuffs.